Version bump for 2.9.0 rc1
Version bump for 2.9.0 rc1

Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Michele Tartara <05f7077a2c6cbbdc4af4ba42e3ef89a0df846179@google.com>

onponomarev/ganeti,grnet/snf-ganeti,yiannist/ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/snf-ganeti,ganeti/ganeti,grnet/snf-ganeti,bitemyapp/ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/ganeti,ganeti/ganeti,andir/ganeti,dimara/ganeti,dimara/ganeti,apyrgio/ganeti,andir/ganeti,mbakke/ganeti,andir/ganeti,leshchevds/ganeti,yiannist/ganeti,mbakke/ganeti,onponomarev/ganeti,leshchevds/ganeti,mbakke/ganeti,leshchevds/ganeti,ganeti/ganeti,bitemyapp/ganeti,yiannist/ganeti,apyrgio/snf-ganeti